Warning

BUILD COST CALCULATOR

A house extension could add value to your home. If you are planning to extend your property why not use our free cost calculator to get a quick estimate of your build costs.

Once you have an idea of the financials it’s time to make your extension a reality. Book your ticket to Grand Designs Live for access to 450+ companies specialising in products and services in build, interiors, kitchens, bathrooms, gardens, technology and more!

Please note:
This information is computer-generated and has been designed to give a useful general indication of costs. We recommend that you obtain exact figures from a specific lender before committing to any mortgage.

Tell us about your Home*

House

Bungalow

Townhouse

Style*

Detached

Semi-detached

Terraced

Tell us about what you need

Type*

Single story extension

Double story extension

Size of Extension

Projection*

Width*

Roof Style*

Flat roof

Pitched roof

Extension Options

Number Of Windows

Velux Roof Windows

French Doors

Patio Doors

Bifold Doors

Roof Lantern

Tell us about yourself

Thank you for using our cost calculator.

Please provide your name and email to complete your quote.

First Name*

Surname*

Email Address*

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